I think boggers or ground hawgs are. But then again if your running thornbirds at the track the track should be dirt or mud not ashphalt.

I dunno about that. I looked high and low for a chart with the weights publish but can't find one. But I have seen one in an old "Fourwheeler" magazine. Size being equal... Thornbirds have WAAYY more rubber and far less voids than the bogger.

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